#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
char* cadastrarLocacaoNome(void);
 
int main(void) {
    char nome[100];
    char *auxiliar = cadastrarLocacaoNome();
 
    if (auxiliar == NULL) {
        puts("Erro ao alocar memoria!");
        return 1;
    }
 
    strcpy(nome, auxiliar);
 
    free(auxiliar);
 
    printf("Nome: %s", nome);
 
    return 0;
}
 
char* cadastrarLocacaoNome(void) {
    char *nomeCliente = malloc(sizeof *nomeCliente * 100);
 
    if (nomeCliente != NULL) {
        printf("Informe o nome do cliente: ");
        fgets(nomeCliente, 100, stdin);
    }
 
    return nomeCliente;
}

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Fulano Filho Teste