(pad-start st len (? ch \space))
  st: a str
  len: an int
  ch: a char (optional)
  returns a str
F

Adds padding characters to the beginning of a string.

Equivalent to pad, but padding characters are added to the beginning of the string, rather than the end.

(ensure (eq? (pad-start "hello" 4) "hello"))
(ensure (eq? (pad-start "hello" 8) "   hello"))
(ensure (eq? (pad-start "hello" 8 \h) "hhhhello"))
pad
pad-end