remove gaps in a filename for "_" then for "nogap" then for "." then for ◄►
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first cd to folder then ::

Code:
for f in *; 
do rename 's/\ * /_/g'   "$f"  "${f%.*}.*" ;done
Code:
for f in *; 
do rename 's/\ * //g'   "$f"  "${f%.*}.*" ;done
Code:
for f in *; 
do rename 's/\ * /./g'   "$f"  "${f%.*}.*" ;done
Code:
for f in *; 
do rename 's/\ * /◄►/g'   "$f"  "${f%.*}.*" ;done