Excel will require a significant manual work.
SOAP API and few lines of JavaScript or jQuery can do that for you if you haev access to web developers.
The process would consist of:
1. SOAP getMultipleLeads to retrieve the lead records from the database.
2. Code fragment of JavaScript to find the white space and updaet the database
var mystring = (get the attribute value from the SOAP API response)
document.getElementById('your_first_name_field').value;
function hasWhiteSpace(s) {
return s.indexOf(' ') >= 0;
// remove the whitespace
// use SOAP syncLead to update
}
or jQuery
if !(your_string.indexOf(' ') === -1)
{
// remove the whitespace
// use SOAP syncLead to update
}