  We compare the effects of in-plane non magnetic Li$^{+}$ and Zn$^{2+}$
impurities on the normal state of high-T$_{c}$ cuprates. Y NMR shows that the
extra hole introduced by Li is not localized in its vicinity. The Tc depression
and induced moments on near neighbour Cu sites of Zn or Li are found identical.
These universal effects of spinless impurities establish the major influence of
the spin perturbation with respect to the charge defect. The susceptibility of
the induced moment measured by Li NMR displays a 1/(T+Theta) behavior. Theta
increases with doping up to about 200 K in the overdoped regime. We attribute
this to a "Kondo like" effect.
