Add docs to functions + Handle unknown command + Repaired some problems from the old functions

src/my_stdio.c

+// SPDX-License-Identifier: BSD-3-Clause
+
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "my_stdio.h"
 
-int my_fwrite(const void *buff, size_t size, size_t nitems,int fd) {
+int my_fwrite(const void *buff, size_t size, size_t nitems, int fd)
+{
 	size_t total_bytes = size * nitems;
 	size_t total_writen_bytes = 0;
 
@@ -17,4 +20,4 @@ int my_fwrite(const void *buff, size_t size, size_t nitems,int fd) {
 	}
 
 	return total_writen_bytes;
-}
\ No newline at end of file
+}

src/my_stdio.h

+/* SPDX-License-Identifier: BSD-3-Clause */
+
 #ifndef _MY_STDIO_H
 #define _MY_STDIO_H
 
-int my_fwrite(const void *buff, size_t size, size_t nitems,int fd);
+int my_fwrite(const void *buff, size_t size, size_t nitems, int fd);
 
-#endif /* _MY_STDIO_H */
\ No newline at end of file
+#endif /* _MY_STDIO_H */

src/my_string.c

+// SPDX-License-Identifier: BSD-3-Clause
+
 #include <sys/types.h>
 
 #include "my_string.h"
 
-size_t my_strlen(const char *s) {
+size_t my_strlen(const char *s)
+{
+	if (!s)
+		return 0;
+
 	size_t cnt = 0;
+
 	while (s[cnt])
 		cnt++;
 	return cnt;
 }
 
-int my_strcmp(const char *s1, const char *s2) {
+int my_strcmp(const char *s1, const char *s2)
+{
 	size_t i;
+
 	for (i = 0; s1[i]; i++)
 		if (s1[i] != s2[i])
 			return s1[i] - s2[i];
-
-	return 	s1[i] - s2[i];
+	return s1[i] - s2[i];
 }
 
-void my_strcat(char *dst, const char *src) {
+void my_strcat(char *dst, const char *src)
+{
 	size_t i = 0;
+
 	while (dst[i])
 		i++;
+
 	size_t j = 0;
+
 	while (src[j]) {
 		dst[i + j] = src[j];
 		j++;
@@ -30,7 +42,8 @@ void my_strcat(char *dst, const char *src) {
 	dst[i + j] = '\0';
 }
 
-void my_strcpy(char *dst, const char *src) {
+void my_strcpy(char *dst, const char *src)
+{
 	for (size_t i = 0; src[i]; ++i)
 		dst[i] = src[i];
-}
\ No newline at end of file
+}

src/my_string.h

+/* SPDX-License-Identifier: BSD-3-Clause */
+
 #ifndef _MY_STRING_H
 #define _MY_STRING_H
 
@@ -6,4 +8,4 @@ int my_strcmp(const char *s1, const char *s2);
 void my_strcat(char *dst, const char *src);
 void my_strcpy(char *dst, const char *src);
 
-#endif /* _MY_STRING_H */
\ No newline at end of file
+#endif /* _MY_STRING_H */

tests/err1.txt

+gcc: fatal error: no input files
+compilation terminated.

tests/numbers

+

tests/out_01.txt

+mumu

tests/out_02.txt

+mumu

tests/out_03.txt

+

tests/out_par1.txt

+beta

tests/out_par2.txt

+alfa

tests/out_seq.txt

+Linux
+test

tests/out_zero1.txt

+test

tests/out_zero2.txt

+test