diff --git a/challenges/cakes-swerc-2020-2021/README.md b/challenges/cakes-swerc-2020-2021/README.md
index 69df1da..3e4b110 100644
--- a/challenges/cakes-swerc-2020-2021/README.md
+++ b/challenges/cakes-swerc-2020-2021/README.md
@@ -25,10 +25,10 @@ this ingredient you have in your kitchen.
 The output should contain a single integer: the maximum number of cakes you can make using the
 available ingredients.
 
-### Limits
+### Constraints
 
-- 1 <= `N` <= 10
-- All ingredient quantities will be integers between 1 and 10 000
+- $$1 <= N <= 10$$
+- All ingredient quantities will be integers between 1 and 10 000.
 
 ## Source
 
diff --git a/challenges/cakes-swerc-2020-2021/solutions/c/function/README.md b/challenges/cakes-swerc-2020-2021/solutions/c/function/README.md
new file mode 100644
index 0000000..a14d7a7
--- /dev/null
+++ b/challenges/cakes-swerc-2020-2021/solutions/c/function/README.md
@@ -0,0 +1,3 @@
+# cakes-swerc-2020-2021/c/function
+
+Created by [@theoludwig](https://github.com/theoludwig) on 21 August 2023.
diff --git a/challenges/cakes-swerc-2020-2021/solutions/c/function/character.c b/challenges/cakes-swerc-2020-2021/solutions/c/function/character.c
new file mode 100644
index 0000000..3e8c0ff
--- /dev/null
+++ b/challenges/cakes-swerc-2020-2021/solutions/c/function/character.c
@@ -0,0 +1,7 @@
+#include "character.h"
+
+void character_append(char* string, char character) {
+  size_t length = strlen(string);
+  string[length] = character;
+  string[length + 1] = '\0';
+}
diff --git a/challenges/cakes-swerc-2020-2021/solutions/c/function/character.h b/challenges/cakes-swerc-2020-2021/solutions/c/function/character.h
new file mode 100644
index 0000000..e3a2037
--- /dev/null
+++ b/challenges/cakes-swerc-2020-2021/solutions/c/function/character.h
@@ -0,0 +1,16 @@
+#ifndef __CHARACTER__
+#define __CHARACTER__
+
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * @brief Append a character to a string, assuming string points to an array
+ * with enough space.
+ *
+ * @param string
+ * @param character
+ */
+void character_append(char* string, char character);
+
+#endif
diff --git a/challenges/cakes-swerc-2020-2021/solutions/c/function/input.c b/challenges/cakes-swerc-2020-2021/solutions/c/function/input.c
new file mode 100644
index 0000000..0e4515c
--- /dev/null
+++ b/challenges/cakes-swerc-2020-2021/solutions/c/function/input.c
@@ -0,0 +1,14 @@
+#include "input.h"
+
+char* input() {
+  char character;
+  size_t length = 1;
+  char* string = malloc(length * sizeof(char));
+  *string = '\0';
+  while ((character = getchar()) != '\n' && character != EOF) {
+    length++;
+    string = realloc(string, length * sizeof(char));
+    character_append(string, character);
+  }
+  return string;
+}
diff --git a/challenges/cakes-swerc-2020-2021/solutions/c/function/input.h b/challenges/cakes-swerc-2020-2021/solutions/c/function/input.h
new file mode 100644
index 0000000..180ae36
--- /dev/null
+++ b/challenges/cakes-swerc-2020-2021/solutions/c/function/input.h
@@ -0,0 +1,16 @@
+#ifndef __INPUT__
+#define __INPUT__
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "character.h"
+
+/**
+ * @brief Read a line from stdin.
+ *
+ * @return char*
+ */
+char* input();
+
+#endif
diff --git a/challenges/cakes-swerc-2020-2021/solutions/c/function/solution.c b/challenges/cakes-swerc-2020-2021/solutions/c/function/solution.c
new file mode 100644
index 0000000..5166316
--- /dev/null
+++ b/challenges/cakes-swerc-2020-2021/solutions/c/function/solution.c
@@ -0,0 +1,87 @@
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "input.h"
+
+size_t string_get_length(const char* string) {
+  size_t length = 0;
+  while (string[length] != '\0') {
+    length++;
+  }
+  return length;
+}
+
+char* string_copy(const char* string) {
+  size_t source_length = string_get_length(string);
+  char* copy = malloc(sizeof(char) * (source_length + 1));
+  if (copy == NULL) {
+    perror("Error (string_copy)");
+    exit(EXIT_FAILURE);
+  }
+  size_t index;
+  for (index = 0; index < source_length; index++) {
+    copy[index] = string[index];
+  }
+  copy[index] = '\0';
+  return copy;
+}
+
+char** string_split(const char* string, char separator, size_t* result_size) {
+  size_t string_length = string_get_length(string);
+  size_t index_string = 0;
+  size_t index_current = 0;
+  size_t index_result = 0;
+  char* current = malloc(sizeof(char) * (string_length + 1));
+  char** result = NULL;
+  if (current == NULL) {
+    perror("Error (string_split)");
+    exit(EXIT_FAILURE);
+  }
+  while (index_string < string_length) {
+    if (string[index_string] == separator) {
+      current[index_current] = '\0';
+      result = realloc(result, sizeof(char*) * (index_result + 1));
+      if (result == NULL) {
+        perror("Error (string_split)");
+        exit(EXIT_FAILURE);
+      }
+      result[index_result] = string_copy(current);
+      index_result++;
+      index_current = 0;
+    } else {
+      current[index_current] = string[index_string];
+      index_current++;
+    }
+    index_string++;
+  }
+  current[index_current] = '\0';
+  result = realloc(result, sizeof(char*) * (index_result + 1));
+  if (result == NULL) {
+    perror("Error (string_split)");
+    exit(EXIT_FAILURE);
+  }
+  result[index_result] = string_copy(current);
+  free(current);
+  *result_size = index_result + 1;
+  return result;
+}
+
+int main() {
+  size_t maximum_number_of_cake_possible = 0;
+  size_t number_of_ingredients = (size_t)atoi(input());
+  for (size_t ingredient_index = 0; ingredient_index < number_of_ingredients; ingredient_index++) {
+    char* string = input();
+    size_t ingredient_size = 0;
+    char** ingredient = string_split(string, ' ', &ingredient_size);
+    int quantity_per_cake = atoi(ingredient[0]);
+    int quantity_available = atoi(ingredient[1]);
+    size_t cake_possible = quantity_available / quantity_per_cake;
+    if (ingredient_index == 0 || maximum_number_of_cake_possible > cake_possible) {
+      maximum_number_of_cake_possible = cake_possible;
+    }
+  }
+  printf("%zu\n", maximum_number_of_cake_possible);
+  return EXIT_SUCCESS;
+}