foo.c: In function 'main':
foo.c:16:15: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
   16 |     printf("%lf", single(output, 0, strlen(output)));
      |             ~~^   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |               |   |
      |               |   int
      |               double
      |             %d
foo.c:12:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   12 |     scanf("%s", input);
      |     ^~~~~~~~~~~~~~~~~~
foo.c: In function 'single':
foo.c:114:1: warning: control reaches end of non-void function [-Wreturn-type]
  114 | }
      | ^

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