Delete Blocks of Whitespace in Emacs -

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i end blocks of code this:

public class customfile {      public string path;     public string name;          public customfile (string pathtofile, string dbname) {     path = pathtofile;     name = dbname;     } }

i want able put cursor on line above public customfile , able delete of whitespace not including public string name;. there command or macro allow me this?

this looks want:

c-x c-o runs command delete-blank-lines, interactive compiled lisp function in `simple.el'.  bound c-x c-o.  (delete-blank-lines)  on blank line, delete surrounding blank lines, leaving one. on isolated blank line, delete one. on nonblank line, delete following blank lines.

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