Strip front lines from text
# Arguments
- a_count : Count of lines to strip ( trimmed )
- a_content : Content to strip
# Demo
```
$syscmd|(top -b1 -n1)
$static(header_lines_from_top,9)
$rename(header_lines_from_top,hlt)
$countl( $stripfl-($hlt()) )
===
221
```
# Example
$assert(a$nl()b,$stripfl(1,c$nl()a$nl()b))