1 files changed, 33 insertions, 0 deletions
diff --git a/src/utils/str.c b/src/utils/str.c
new file mode 100644
index 0000000..499f781
--- /dev/null
+++ b/src/utils/str.c
@@ -0,0 +1,33 @@
+#include "str.h"
+#include <stddef.h>
+
+size_t strlen(const char *str) {
+  size_t size = 0;
+  for (; (str[size]) != '\0'; size++) {
+  }
+  return size;
+}
+
+char *str_reverse(char *str) {
+  char *str_ptr = str;
+  size_t size = strlen(str);
+  char return_str[size];
+
+  for (size_t i = 0; i < size; i++)
+    return_str[size - i - 1] = str[i];
+
+  for (size_t i = 0; i < size; i++)
+    *str_ptr++ = return_str[i];
+
+  return str;
+}
+
+char *itoa(int num, char *str) {
+  char *str_ptr = str;
+  for (; num;) {
+    *str_ptr++ = num % 10 + 48;
+    num /= 10;
+  }
+  str_reverse(str);
+  return str;
+}