string: remove abs()
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				|  | @ -724,13 +724,6 @@ fn (u ustring) free() { | |||
| 	u.runes.free() | ||||
| } | ||||
| 
 | ||||
| fn abs(a int) int { | ||||
| 	if a >= 0 { | ||||
| 		return a | ||||
| 	} | ||||
| 	return -a | ||||
| } | ||||
| 
 | ||||
| pub fn (c byte) is_digit() bool { | ||||
| 	return c >= `0` && c <= `9` | ||||
| } | ||||
|  |  | |||
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