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#include <stddef.h> size_t strlen(const char *s) { size_t c = 0; while (s[c]) c++; return c; } char *strcpy(char *restrict dst, const char *restrict src) { size_t pos = 0; size_t len = strlen(src) + 1; for(pos = 0; pos <= len; pos++) dst[pos] = src[pos]; return dst; }