#ifndef UTILS_H
#define UTILS_H

/* function: char *string_format(char* string)
 * input: pointer to a null-terminated string (must not be NULL)
 * return: pointer to a newly allocated string containing all space-separated words,
 * 	joined by single spaces; leading/trailing/multiple spaces are ignored.
 * on-error: returns NULL if memory allocation fails
 * misc: the returned pointer must be freed by the caller using free()
 * limits: processes at most 10 words, each up to 49 characters (last '\0')
 */
char *string_format(char* string);

// function: char *concat(const char *str1, const char *str2)
// input two char pointer
// return: pointer to string
// on-error: returns NULL
// misc: caller needs to free the memory
char *concat(const char *str1, const char *str2);

#endif